This episode stands out for many reasons. Its setting most obviously, but also its structure. While many episodes in this adaptation suffered from overstuffing, this one kept a single clear storyline. Despite this, it did not quite work because it was fairly aimless. We follow along without really knowing where or why we are going, and the episode felt like a mere setup for the next one.
It still had good moments. It gave us nice insights into the trauma of some characters, which is great to set-up their arcs. It also had a cathartic reunion.
On the downside, while I am willing to accept the breaking of dozens of rules and pieces of lore from the original show in this episode, the new interpretation of Azula's story is just not working for me. I feel that it weakens her character.
Overall, some may like the very unusual and fantastical elements of this episode. Personally, I appreciated the character moments and the breathing space the episode provided, but there was a lack of direction and clear hook which prevented me from fully enjoying the episode.